JavaScript Objects and Prototypes

Create Objects

Using function

Create Objects without duplication code: use functions

Using constructors

To indicate a function is a constructor:

append new keyword in front of the function name when executing it

Call

Property of function object
foo.call() = foo()
Call can bind different objects and can execute functions

__proto__

Copy of prototype object

If some property is not in the object itself, it then looks it in the prototype. If it finds it returns the value of that property
All the new object instances of function point to same prototype object
prototype.constructor: property that points to function

GitHub repo: https://github.com/kaosadi17/JavaScript/blob/master/objects%26prototypes.js

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Object Oriented Programming (OOP)

Object Object is an entity that has state and behavior Class Collection of objects is known as class. There are four main types of OOP concepts Inheritance Object acquire all the properties and behavior of parent object Improve code re-usability Polymorphism One task is performed by different ways Use method overload and override Abstraction Hiding internal details and showing functionality Use abstract class and interfaces Encapsulation Binding code and data into a single unit

Model-View-Controller (MVC)

MVC(Model-View-Controller) is a software design pattern.It divided your applications into three components Model: Contain business rules and application Data View: Presentation layer (user interface) Controller: Handles the communication between view and model Objectives of MVC Promote code usability Implement separation of concerns Separate user interface and software logic Web Frameworks That Use MVC There are several web frameworks that use MVC design pattern. Ruby On Rails (Ruby) Angular (JS) Django (Python) Express (JS) Flask (Python) Codeigniter (PHP) Simple UseCase for MVC In this use case scenario, Browser sends information that needs to create Employee Object, and Controller save that information in Model and Update the Employee View. Following Image shows the class diagram for above Scenario. Implementation: https://github.com/kaosadi17/MVC

Sorting Algorithms

Bubble Sort Named as sinking sort. Compare each pair of the adjacent items and swap them if they are in the wrong order. Worst case and average case time complexity both O(n^2) and best case time complexity is O(n).

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